Blue Line
Blue Line 17/49T Starter Reduction Gear - GY6
Description
Get your scooter back to dependable electric starting with the Blue Line Starter Reduction Gear for compatible GY6 engines. This stepped, two-stage gear transfers drive through the starter reduction system, making it a practical replacement for a worn or damaged gear. Its 17-tooth upper gear, 49-tooth lower gear and 10 mm center bore give you clear reference points for matching your original part.
Key Features
- Starter Drive Replacement: Replaces a worn or damaged reduction gear in a matching electric-start system.
- Two-Stage Design: Combines a smaller upper gear and larger lower gear in one stepped assembly.
- 17/49-Tooth Configuration: Matches starter systems using 17 upper teeth and 49 lower teeth.
- 10 mm Center Bore: Provides a key fitment measurement for comparison with the original gear.
Technical Specifications
- Brand: Blue Line
- Part number: 1100-1128
- Original Parts for Scooters SKU: 164-123
- Manufacturer part number: 3121002
- Component: Starter reduction gear
- Inner diameter: 10 mm
- Upper gear: 17 teeth
- Lower gear: 49 teeth
Compatibility
For compatible GY6 125–150cc starter systems and related 157QMJ-based 125cc, 150cc and 169cc applications using the same gear configuration.
| Engine family / codes | Fitment check |
|---|---|
| 157QMJ, 152QMI, YN1P57QMJ, JJ157QMJ, 1P57QMJ, BN157QMJ | Match the 10 mm bore, 17/49 teeth, gear diameters, overall height and starter-drive layout. |
| 161QMK, 1P61QMK, BN161QMK-A | For configurations using the matching starter reduction gear; compare the original part before ordering. |
| 1P52FMI, 154FMI and other QMI/QMJ/QMK configurations | Confirm the actual starter gear dimensions and tooth configuration. |
Engine code or displacement alone does not establish compatibility. Having “QM” or “FM” in the code is not enough to confirm fitment. Compare your original gear's bore, tooth counts, diameters, height and drive arrangement before ordering.
Product Diagrams
Features
Specifications
Brand: Blue Line; Part number: 1100-1128; Original Parts for Scooters SKU: 164-123; Manufacturer part number: 3121002; Component: starter reduction gear; Inner diameter: 10 mm; Upper gear: 17 teeth; Lower gear: 49 teeth; Application: compatible GY6 starter systems; Confirm gear diameters, height and starter-drive layout
Model Fitments
Compatible GY6 125/150cc and related 157QMJ-based 125cc/150cc/169cc starter systems; engine applications: 157QMJ, 161QMK, 152QMI, 1P61QMK, YN1P57QMJ, 1P52FMI, 154FMI, JJ157QMJ, 1P57QMJ, BN157QMJ, BN161QMK-A and matching QMI/QMJ/QMK configurations; verify 10 mm bore, 17/49 teeth, gear diameters, overall height and starter-drive layout; engine code alone does not establish fitment
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Same day shipping for orders placed before 2PM (CST) M-F
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30-day return period on eligible items
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Flat-rate shipping for orders shipped to the 48 Contiguous United States.
